Each rollout is a cabinet without doors turned on its back. Resize these cabs to fit in the base cab and you can place them inside the base cab while in the cab editor. It took some time to get the hang of it.

Roger,
You can actually choose the exact door you want in in the cabinet assembly editor. Click on Load in the editor and choose Door/Drawer at the bottom of the list that pops up. Then place them manually as Dan suggests.
Kerry